exam Maths Puzzle Numerical Ability

Find the domain of the following function f(x)=the square root of the quantity 2x+5

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please help me! i dont know how to do this...

find coordinates of for the centroid whose triangle verticies are (a,p) (b,q) and (c,r). then find the centroid for (-1,5) (-2,8) and (3,3) I need help with this problem, will someone please help me solve this problem?
The problem says to solve for x and express answer in interval notation and to show all steps: -4(2x+3)-2(x+4)<0